Patent GB-1003199-A (GB)
Title: Improvements in or relating to water-laid products
Inventor: FEIGLEY DAVID ALEXANDER
IPC: C04B20/12
Filed: 1961-09-21
Abstract: A ceramic is made by firing a water-laid product which comprises water-insoluble inorganic particles whose surfaces have been treated with a polyvalent metal ion having a charge of at least +3 and then reacted with 0.2-20% by weight based on the dry weight of the particles of a salt of an organic acid. The acid is (a) a non-polymeric, acyclic, aliphatic acid having at least ten carbon atoms and one or more carboxylic acid groups, or (b) a dimer or trimer of such an acid, or (c) a Diels-Alder adduct of such an acid. The inorganic particles may be fibrous, non-fibrous or a mixture of the two.  Fibrous materials referred to are asbestos, glass, quartz, mineral wool, carbon, aluminium silicate, potassium titanate and brucite.  Non-fibrous particles are clay, bentonite, diatomaceous earth, fuller's earth, hydraulic cement, limestone, silica, sand, oxides of zinc magnesium or iron or other hydroxides, carbonates or sulphides.  The polyvalent metal ion may be that of aluminium, e.g. in the form of papermaker's alum or a nitrate, sulphate or chloride of aluminium, arsenic, bismuth, chromium, iron, germanium, manganese, molybdenum, antimony, tin, titanium, vanadium, tungsten, zirconium or precious metals or rare-earth metals.  The organic acid may be saturated or olefinically unsaturated, e.g. a fatty acid or mixtures of fatty acids from natural sources or their dimers or trimers or may contain an aromatic substituent in the aliphatic chain.  The product may be made by forming with water a slurry of the particles, adding a salt containing the polyvalent metal ion, then adding a water-soluble salt of the organic acid in an amount of 0.2 to 20% of the dry particles, agitating the mixture to cause the salt to react with the surfaces of the particles, and forming the product by draining off the water.  Sizes such as starch, casein, cellulosic gums, copolymers of butadiene and styrene or acrylnitrile or polychloroprene synthetic rubber may be used. The products may be in the form of paper, felt, or board and may be made on a fourdrinier or cylinder machine or may be shaped in a mould. After firing, the product may be used as insulators or liners.ALSO:A water-laid product comprises water-insoluble inorganic particles whose surfaces have been treated with a polyvalent metal ion having a charge of at least +3 and then reacted with 0.2-20% by weight based on the dry weight of the particles of a salt of an organic acid.  The acid is (a) a non-polymeric, acyclic, aliphatic acid having at least ten carbon atoms and one or more carboxylic acid groups, or (b) a dimer or trimer of such an acid, or (c) a Diels-Alder adduct of such an acid. The inorganic particles may be fibrous, non-fibrous or a mixture of the two.  Fibrous materials referred to are asbestos, glass, quartz, mineral wool, carbon, aluminium silicate, potassium titanate and brucite. Non-fibrous particles are clay, bentonite, diatomaceous earth, fuller's earth, hydraulic cement, limestone, silica, sand, oxides of sinc magnesium or iron or ther hydroxides, carbonates or sulphides.  The polyvalent metal ion may be that of aluminium, e.g. in the form of papermakers alum or a nitrate, sulphate or chloride of aluminium, arsenic, bismuth, chromium, iron, germanium, manganese, molybdenum, antimony, tin, titanium, vanadium, tungsten, zirconium or precious metals or rare-earth metals.  The organic acid may be saturated or olefinically unsaturated, e.g. a fatty acid or mixtures of fatty acids from natural sources or their dimers or trimers or may contain an aromatic substituent in the aliphatic chain.  The product may be forming with water a slurry of the particles, adding a salt containing the polyvalent metal ion, then adding a water-soluble salt of the organic acid in an amount of 0.2 to 20% of the dry particles, agitating the mixture to cause the salt to react with the surfaces of the particles, and forming the product by draining off the water. Sizes such as starch, casein, cellulosic gums, copolymers of butadiene and styrene or acrylnitrile or polychloroprene synthetic rubber may be used.  The products may be in the form of paper, felt, or board and may be made on a fourdrinier or cylinder machine or may be shaped in a mould.  The felt may be used as a vibration-damping felt having fireproof properties.